Yes it would be tough than previous exams but sit relax it wont be as tough as this years jee main paper

You should have good knowledge of all topics as in NCERT, that is the utmost requirement.
You can refer jee papers as reference
Solve all last year papers of MHTCET

The level of MHCET for engineering admissions is going to get tougher and at par with JEE from 2018, to help students prepare well for both state and national level entrance exams, the Maharashtra state government has decided to raise the standard of the state CET from this year. 

But you should not take the additional pressure of it right now and concentrate on your JEE Preparation because if you can prepare well for JEE Main then you will be able to catch up any level of MHT CET.

All the very best and good luck.

In 2018, there will be only one entrance exam to take admission in engineering colleges including state and private colleges. This proposal is approved by AICTE.

All the Best!!